package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.util.StringUtil;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.oxm.xstream.XStreamMarshaller;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        // 存储从开始到结束的每一天的日期
        List<LocalDate> dateList = new ArrayList<>();
        // TODO equals()比较相等
        // TODO LocalDate向后加一天
        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            // 查询date日期对应的营业额数据
            // TODO LocalDate与LocalDateTime的转换，获取当天最开始的时间
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            // select sum(amount) from orders where order_time > ? and order_time < ? and status = 5
            Map map = new HashMap();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            // TODO 通过传入map参数控制Mapper层
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }
        // TODO StringUtils方法类
        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList,','))
                .turnoverList(StringUtils.join(turnoverList,','))
                .build();
    }

    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        // 存储从开始到结束的每一天的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);

        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        // 存放每天新增用户数量 select count(id) from user where create_time > ? and create_time < ?
        List<Integer> userList = new ArrayList<>();
        // 存放每天总用户数量 select count(id) from user where create_time < ?
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("end",endTime);
            Integer totalUser = userMapper.countByMap(map);
            totalUserList.add(totalUser);
            map.put("begin",beginTime);
            Integer newUser = userMapper.countByMap(map);
            userList.add(newUser);
        }
        // 封装结果数据
        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList,','))
                .newUserList(StringUtils.join(userList,','))
                .totalUserList(StringUtils.join(totalUserList,','))
                .build();
    }

    @Override
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        // 存储从开始到结束的每一天的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);

        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        // 存放每天的订单总数
        List<Integer> orderCountList = new ArrayList<>();
        // 存放每天有效的订单数
        List<Integer> validOrderCountList = new ArrayList<>();
        // 遍历dateList查询每天的有效订单数和订单总数
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("begin",beginTime);
            map.put("end",endTime);
            // 查询每天的订单总数 select count(id) from orders where order_time > ? and order_time < ?
            Integer everydayOrders = orderMapper.countByMap(map);
            orderCountList.add(everydayOrders);
            // 查询每天的有效订单总数 select count(id) from orders where order_time > ? and order_time < ? and status = 5
            map.put("status",Orders.COMPLETED);
            Integer vaildOrders = orderMapper.countByMap(map);
            validOrderCountList.add(vaildOrders);
        }
        // 计算时间内的订单总数量
        // TODO Stream流的实现案例
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        // 计算时间内的有效订单总数量
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        // TODO integer转double
        double orderCompletionRate  = 0.0;
        if (totalOrderCount != 0) {
            // 计算订单完成度
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,','))
                .orderCountList(StringUtils.join(orderCountList,','))
                .validOrderCountList(StringUtils.join(validOrderCountList,','))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        // select name,sum(number) from order_detail od ,orders o where od.order_id = o.id and o.status = 5 and o.order_time > ? and o.order_time < ? group by od.name order by number desc limit 0,10
        // TODO 查询两张表和运用连接的区别
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);

        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());

        return SalesTop10ReportVO.builder()
                .nameList(StringUtils.join(names,','))
                .numberList(StringUtils.join(numbers,','))
                .build();
    }

    @Override
    public void exportBusinessData(HttpServletResponse response) {
        // 查询数据库，获取营业数据----查询最近三十天的运营数据
        // 向前获取30天前的时间数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        // 查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        // 通过POI将数据写入到Excel文件中
        // 获取rescource作为输入流
        // TODO 下面这句话的具体实现逻辑
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
            // TODO POI的实现案例
            XSSFWorkbook excel = new XSSFWorkbook(in);

            // 填充数据
            XSSFSheet sheet = excel.getSheet("Sheet1");
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);
            // 获得第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            // 获得第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                // 查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            // 通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            // 关闭资源
            out.close();
            excel.close();

        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }
}
